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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.semantics.rule;
import java.util.Set;
import com.yahoo.prelude.semantics.engine.RuleEvaluation;
/**
* A new term produced by a production rule
*
* @author bratseth
*/
public abstract class Production {
/** True to add, false to replace, default true */
protected boolean replacing=true;
/** The (0-base) position of this term in the productions of this rule */
private int position=0;
/** The weight (strength) of this production as a percentage (default is 100) */
private int weight=100;
/** Creates a produced template term with no label and the default type */
public Production() {
}
/** True to replace, false to add, if this production can do both. Default true. */
public void setReplacing(boolean replacing) { this.replacing=replacing; }
public int getPosition() { return position; }
public void setPosition(int position) { this.position = position; }
/** Sets the weight of this production as a percentage (default is 100) */
public void setWeight(int weight) { this.weight=weight; }
/** Returns the weight of this production as a percentage (default is 100) */
public int getWeight() { return weight; }
/**
* Produces this at the current match
*
* @param e the evaluation context containing the current match and the query
* @param offset the offset position at which to produce this. Offsets are used to produce multiple items
* at one position, inserted in the right order.
*/
public abstract void produce(RuleEvaluation e,int offset);
/**
* Called to add the references into the condition of this rule made by this production
* into the given set. The default implementation is void, override for productions
* which refers to the condition
*/
void addMatchReferences(Set<String> matchReferences) { }
/** All instances of this produces a parseable string output */
public final String toString() {
return toInnerString() + (getWeight()!=100 ? ("!" + getWeight()) : "");
}
/** All instances of this produces a parseable string output */
protected abstract String toInnerString();
}
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